Toggle navigation Toggle navigation
Back Sign In
 SET YOUR CAR
Buy Now, Pay Later!
FREE SHIPPING
On orders over $200
TALK TO A PARTS EXPERT
RALLYSPORT GUARANTEE
100% Money Back on Select Parts

GrimmSpeed OEM Downpipe to 3in Cat Back Adapter

MODEL # GRM 077046

$39.00

View Product

  • Q: Tomei ti catback/COBB downpipe  Nelson Asay5 months ago

    is this what I would need to make sure the Tomei ti catback for my COBB downpipe to bolt up correctly?

  • Q: Installing Invidia Downpipe to N1 Race Exhaust  Zystus6 months ago

    I am currently using this on my stock DP with the Invidia N1 Race Exhaust but now I am going to buy an Invidia Downpipe, would this still work? Or do I have to buy another gasket for the set up?
    • 0 of 0 people found the following answer helpful

      A:  This will work while you're running the OEM downpipe. Once you install the Invidia, you'll just want a regular 3" 2 bolt gasket.

      Marcus E. @ RallySport Direct 4 months ago  
        
      Was this answer helpful?

  • Q: Mazdaspeed  Mazdaspeed 6 months ago

    Is it compatible with mazdaspeed 3 with catback 3 "and test pipe 2'5"oem ??
    • 0 of 0 people found the following answer helpful

      A:  This is only confirmed to fit the Subaru models we cannot confirm them to fit the MazdaSpeed3.

      Jared A. @ RallySport Direct 6 months ago  
        
      Was this answer helpful?

  • Q: 2013 subaru wrx hatch w/ invidia r400   boxerengine117 months ago

    i bought the invidia r400 for my 2013 subaru wrx hatch. im not sure if im only supposed to use the gasket that comes with the exhaust or will i need to buy this also with the donut gasket or reuse the oem donut gasket?

  • Q: Correct adapter??  GeorgeV11 months ago

    I will be going with the COBB resonated j-pipe and the Invidia N1 catback. Is this the right adapter or what do I need? Can’t find a solid question. Thanks!
    • 1 of 1 people found the following answer helpful

      A:  Yes, this will be the adapter you will need.

      Tyler A. @ RallySport Direct 11 months ago  
        
      Was this answer helpful?
    • 1 of 1 people found the following answer helpful

      A:  Answered my own question when I bought the Cobb downpipe and Invidia cst back: no you do not need this. Kinda peeved I wasted the money when the Cobb comes with a regular flange and just an adapter for the stock donut style.

      GeorgeV
        
      Was this answer helpful?

  • Q: Namless Catback exhaust   Chris 11 months ago

    Hi i currently have a nameless catback exhaust setup and plan on getting an invidia downpipe, would i still need to get this adpater?
    • 0 of 0 people found the following answer helpful

      A:  You will need the opposited adapter that converts a 3 inch downpipe to OEM exhaust. Yes I am aware you said Nameless catback but you will still be utilizing stock sizing.

      Tyler A. @ RallySport Direct 11 months ago  
        
      Was this answer helpful?

  • Q: Will I need this adapter for 2017 WRX OEM downpipe and Invidia R400?  WRX1 year ago

    Will I need this adapter for 2017 WRX OEM downpipe and Invidia R400? R400 is 3 inch which matches the OEM downpipe size.
    • 0 of 0 people found the following answer helpful

      A:  The OEM downpipe on ALL Subaru models are 2.5 inches. You will need this adapter if you plan to run any Invidia Exhaust

      Tyler A. @ RallySport Direct 1 year ago  
        
      Was this answer helpful?

  • Q: Adapter gasket  D1 year ago

    Does this adapter come with a donut gasket or is that sold separately?

  • Q: Gasket   Andrew35 1 year ago

    Will this adapter work with my 06 sti. I have a p&l straight pipe, with a stock down pipe ?

  • Q: Tomei Catback to Invidia Catless Downpipe  joelangreo1 year ago

    Hi, I've currently been using this part to connect my tomei catback to my stock downpipe. Do I still need this part now that I am about to install my invidia catless downpipe? (car is 2016 wrx manual)
    • 0 of 0 people found the following answer helpful

      A:  No you will not. The Tomei catback and the Invidia downpipe will mate up no problem.

      Tyler A. @ RallySport Direct 1 year ago  
        
      Was this answer helpful?

  • Q: Exhaust seal  Neez 063 years ago

    I want to connect oem dp to 3in CB. To get a perfect seal with this product , will I still need to use the stock donut gasket on the dp side and a 3in gasket on the CB side?
    • 0 of 0 people found the following answer helpful

      A:  Yes, you will want the OEM donut gasket on the down pipe, then the adapter, then the gasket to the catback. There is a picture under User Media on this product page that gives a good explanation of how the products should sit.

      Chris W. @ RallySport Direct 3 years ago  
        
      Was this answer helpful?

  • Q: Fitting  Gregboy3 years ago

    I plan on buying the N1 Duel this week. You recommended this part, but when I added it to my basket it told me that it would not fit my 2015 WRX. Are you sure this is the right part?
    • 0 of 0 people found the following answer helpful

      A:  Although your car is not on the confirmed applications list, I dont see there being any issues with using this adapter.

      Josh P. @ RallySport Direct 3 years ago  
        
      Was this answer helpful?

  • Q: adapter  noahmancini127653 years ago

    Are there any other options for this? the adapter is to wide and will not fit with the stock downpipe bolts unless the holes are elongated. I've tried to install with a 2.5 downpipe to a 3inch invidia n1 and it would not fit/align correctly.
    • 0 of 0 people found the following answer helpful

      A:  Generally we dont have any fitment issues with this product. Please call us so we can better assist.

      Trevor C. @ RallySport Direct 3 years ago  
        
      Was this answer helpful?

  • Q: Will I need this?  jpdoeun717553 years ago

    I have a Cobb downpipe and Perrin catback exhaust that I am going to put on my 2014 WRX hatchback. Will I need this adapter for this combination?

  • Q: Help  jacobo_divine360163 years ago

    So I have an invidia catback exhaust hooked up to stock dp, I have some exhaust leak but also have it rattling a lot. Would this along with the stock donut gasket help the rattling?
    • 0 of 0 people found the following answer helpful

      A:  this is designed to work along with the donut, and is a 100% must to insure no exhaust leaks.

      Trevor C. @ RallySport Direct 3 years ago  
        
      Was this answer helpful?

  • Q: exhuast work  will this fit a wrx oem exhaust?3 years ago

    Im bolting the oem wrx 05" catback. Back onto the car and was wondering if these would work. If not could you guys lead me to a prouduct that would?
    • 0 of 0 people found the following answer helpful

      A:  This is for connecting a stock downpipe to a Aftermarket 3inch catback exhaust. If you are connecting the stock exhaust to the OEM downpipe, then you need a donut gasket. http://www.rallysportdirect.com/shop/product/sub-44022aa123-subaru-oem-donut-gasket

      Trevor C. @ RallySport Direct 3 years ago  
        
      Was this answer helpful?

  • Q: COBB Catback  Matt_G3 years ago

    Bought a used Cobb Catback will i need this to connect to my stock downpipe?
    • 0 of 0 people found the following answer helpful

      A:  This adapter is not necessary or recommended for the Cobb catback because the Cobb exhaust already comes with a tapered flange.

      Zach G. @ RallySport Direct 3 years ago  
        
      Was this answer helpful?

  • Q: fitment  JC473 years ago

    Will I need this when I get the Tomei Expreme Ti Titanium Catback to fit to my stock down pipe?
    • 0 of 0 people found the following answer helpful

      A:  This adapter will help seal any of the 3 inch 2 bolt flanged catbacks like the Tomei when using the stock downpipe.

      guest569faaee2a8d2517038b4568 @
        
      Was this answer helpful?

  • Q: Will this work with a fujitsubu cat back?  $teveMac3 years ago

    Will this work with a fujitsubu catback exhaust??
    • 0 of 0 people found the following answer helpful

      A:  We do not carry the Fujitsubu and cannot confirm. If the flange is a 2 bolt 3 it will work, if it tapers down to accept the stock donut gasket it will not be required.

      Nick S. @ RallySport Direct 3 years ago  
        
      Was this answer helpful?

  • Q: Will this fit on a Perrin catback system  carlopelaez326753 years ago

    I just bought a used Perrin catback system which was missing the M8 hardware that connects from OEM downpipe to the Perrin midsection. Will this adapter work with the OEM donut, or will I have to eliminate the donut?
    • 0 of 0 people found the following answer helpful

      A:  This will work with any 3 inch catback to OEM downpipe. Yes, It will reuse the donut gasket.

        
      Was this answer helpful?

  • Q: Need this?  Dakotat44 years ago

    I'm buying the Invidia N1 dual exhaust for my 2011 subaru WRX that is all stock so I was wondering if all I need is a donut gasket and this part as well? Everything is stock. Is this all I need?
    • 0 of 0 people found the following answer helpful

      A:  Yes, That should be all you need to make sure you have a good seal from OEM downpipe and 3 inch Catback.

      guest569faaee2a8d2517038b4568 @
        
      Was this answer helpful?

  • Q: '99 Impreza GT and Gasket doubt  axierjhtjz4 years ago

    Hi, will this work on my '99 Impreza GT with stock Downpipe? Also, the gasket from the first photo is included?
    • 0 of 0 people found the following answer helpful

      A:  This gasket for 3 inch turbo model Subaru's so this would not fit your car.

      Tommy M. @ RallySport Direct 4 years ago  
        
      Was this answer helpful?
    • 0 of 0 people found the following answer helpful

      A:  The gasket would not fit but the adapter will? DOo you have any adapter for '99 Impreza GT to 3 Catback?

      axierjhtjz
        
      Was this answer helpful?

  • Q: 2015 WRX  zsalazar109076184 years ago

    will this work on a stock downpipe to a Tomei Expreme Ti exhaust?
    • 0 of 0 people found the following answer helpful

      A:  This adapter will work on a 2015 STI with an OEM downpipe and the Tomei TI.

      Kyle A. @ RallySport Direct 4 years ago  
        
      Was this answer helpful?
    • 0 of 0 people found the following answer helpful

      A:  If the Tomei exhaust uses a 3 2 bolt flange where it mounts to the downpipe then it should work great! Mike

      GrimmSpeed
        
      Was this answer helpful?

  • Q: 2015 sti  Abui4 years ago

    will this fit the invidia n1 exhaust on the 15 sti?

  • Q: 2004 FXT OEM Downpipe to invidia 3  hmelvin4 years ago

    I am going to connect and invidia g200 to my stock downpipe, what else do I need besides this adapter?
    • 0 of 0 people found the following answer helpful

      A:  This will come with everything needed to install. You can simply reuse your oem donut gasket if it's condition is good. Or buy a replacement which you can find searching Part # SUB 44022AA123

      Brady R. @ RallySport Direct 4 years ago  
        
      Was this answer helpful?

  • Q: Cobb downpipe to invidia 3inch exhaust  Bspad544 years ago

    I have a 2004 wrx with a cobb downpipe, if i were to connect an invidia 3inch cbe will i need this adapter?
    • 0 of 0 people found the following answer helpful

      A:  It would not be required, but highly recommended to avoid exhaust leaks.

      guest56ad69792a8d256e198b66b5 @
        
      Was this answer helpful?

  • Q: GRM 077046 for 2015 STI  toyotrust4 years ago

    When I searched parts for my car this item is not coming up. Just wanted to confirm fitment for my 2015 STI, I will be using the Invidia Q300 and stock downpipe. Will it fit?

  • Q: diameter question   prescottbradley929054894 years ago

    I have a 3 Invidia downpipe. I have a 3 Invidia exhaust. I need to buy a high flow catalytic converter. If I got a cat with a 2.5 diameter, would this adapter kit work to seal it off if i weld it on to both sides of the cat so i dont have to weld my Invidia exhaust?
    • 0 of 0 people found the following answer helpful

      A:  This is intended to mate a 2.5 inch connection to a 3 inch connection. So if that be the case, it will work great!

      Sterling W. @ RallySport Direct 4 years ago  
        
      Was this answer helpful?

  • Q: 3 inch gasket  warrenarlie806764 years ago

    My question is which side does the included 3 gasket go? Does it go on downpipe side along with the donut gasket or does it go on the catback side
    • 1 of 1 people found the following answer helpful

      A:  The 3 gasket goes on the flat side and the donut goes on the side that's indented to fit it flush. Mike

      GrimmSpeed
        
      Was this answer helpful?

  • Q: Q300 invidia wrx 14  rodo_21528514 years ago

    Alright so I do have OEM DP. So will be needing this product. I'm also going to be getting the long hangers. Is there anything else I will need? Or that is reccomend?
    • 1 of 1 people found the following answer helpful

      A:  The only other item I would recommend is a replacement donut gasket. Which you can find on our site! Part # SUB 44022AA123

      Brady R. @ RallySport Direct 4 years ago  
        
      Was this answer helpful?